As Salaam Aleikum wa Rahmatullahi wa Barakatuh.
(May Allah's Peace, Mercy and Blessings be upon all of you)

One of our brothers/sisters has asked
this question:

How is do we know Almighty Allah has forgiven our
sins.

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Answer:

How would one know
that Allah has forgiven sins

In the name of Allah,
We praise Him, seek His help and ask for His forgiveness. Whoever Allah
guides none can misguide, and whoever He allows to fall astray, none can guide
them aright. We bear witness that there is none worthy of worship but Allah
Alone, and we bear witness that Muhammad (saws) is His slave-servant and the
seal of His Messengers.

When one who has sinned turns in
repentance towards their Lord Most Merciful, one obviously does not receive a
written ‘receipt’ for ones repentance!

When one who is involved in sins
does ‘taubah’ and turns unto their Lord in sincere repentance, The Lord Most
Gracious has promised in His Glorious Quran that He accepts their repentance
and obliterates their sins….one who professes belief must have faith and trust
in the Promises of their Lord Creator.

Allah says in the Holy
Quran Chapter 39 Surah Zumur verses 53-54:

(O Prophet) say: “O My
servants who have wronged their own souls….Do not despair of Allah’s
Mercy!Surely, Allah forgives all sins.He indeed is the All Forgiving,
All Merciful.Return to your
Lord and submit to Him before the scourge overtakes you;for then you may get no help from anywhere.”

Allah likes such good
people very much, who,if ever they
commit a base deed or wrong their own soul by the commission of a sin,remember Allah instantly,and ask for forgiveness from Him for their
shortcomings.For who,but Allah,can forgive sins?(And Allah loves those) who do not knowingly
persist in the wrongs they did.These
will be rewarded with forgiveness from Allah,and with Gardens beneath which canals flow,and they will reside therein forever!How excellent is the reward of those who do
good deeds!

Allah says in the Holy
Quran Chapter 25 Surah Furqaan verses 63-71:

The (true) servants of
the Merciful are those who walk humbly on the earth.When the ignorant people behave insolently
towards them,they say, “Peace to you”;(And those) who pass their nights in
prostrating themselves and standing before their Lord and pray, “O our
Lord,save us from the torment of
Hell,for its torment is killing!It is an evil abode,and an evil resting place”.(And those) who,when they spend are neither extravagant,nor miserly,but keep the golden mean between the two extremes.(And those) who do not invoke any god but
Allah Alone,nor kill a soul
unjustly,which Allah has
forbidden,nor commit adultery… He who
does this shall be punished for his sin,and his torment shall be doubled on the Day of Resurrection,and he shall abide in a state of
ignominy;EXCEPT THE ONE WHO MAY HAVE REPENTED (AFTER THOSE SINS),AND HAVE BELIEVED AND DONE RIGHTEOUS
DEEDS.For then,Allah will change his evil deeds into good
deeds,and He is very Forgiving and
Merciful.In fact,one who repents and does righteous
deeds,returns to Allah as one rightly
should!

Allah says in the Holy
Quran Chapter 6 Surah Anaam verse 54:

When those come to you
who believe in Our Signs,say:
"Peace be on you!Your Lord had
inscribed for Himself (the rule of) Mercy.Verily if any of you did evil
in ignorance,and thereafter repented
and amended (his conduct),Lo! He is
Oft-Forgiving,Most Merciful."

Al-Tirmidhi Hadith
2357Narrated by Abdullah ibn
Mas'ud

Allah's Messenger
(saws) said, "He who repents of
a sin is like him who has committed no sin."

Allah's Messenger
(saws) said that the Shaytaan said, "By Thy Might, my Lord, I shall
continue to lead Thy servants astray as long as their spirits are in their bodies!"The Lord, Who is Great and Glorious, replied,
"By My Might, Glory and Exalted
Station, I shall continue to pardon them as long as they ask My
forgiveness!"

Some scholars have opined that
one of the evident signs of one’s acceptance of ‘taubah’ or repentance is that
the Lord Most Gracious gives that person the ‘tawfeeq’ to do good righteous
deeds. And Allah Alone Knows Best.

Whatever written of
Truth and benefit is only due to Allah’s Assistance and Guidance, and whatever
of error is of me alone.Allah Alone
Knows Best and He is the Only Source of Strength.